Fluid pump apparatus

• US 20020009363A1
• Filed: 05/16/2001
• Published: 01/24/2002
• Est. Priority Date: 05/19/2000
• Status: Active Grant

• Current Assignee: NTN Corporation
• Original Assignee: NTN Corporation, Terumo Kabushiki Kaisha (Terumo Corporation)
• Inventors: Suzuki, Minoru, Ozaki, Takayoshi
• Granted Patent: US 6,547,530 B2
• Time in Patent Office: Days
• US Class Current: 415/203
• CPC Class Codes: A61M 60/148 in line with a blood vessel using resection or like techniques, e.g. permanent endovascular heart assist devices
• CPC Class Codes: A61M 60/216 including a rotating member acting on the blood, e.g. impeller
• CPC Class Codes: A61M 60/419 the force acting on the blood contacting member being permanent magnetic, e.g. from a rotating magnetic coupling between driving and driven magnets
• CPC Class Codes: A61M 60/422 the force acting on the blood contacting member being electromagnetic, e.g. using canned motor pumps
• CPC Class Codes: A61M 60/515 Regulation using real-time patient data
• CPC Class Codes: A61M 60/538 Regulation using real-time blood pump operational parameter data, e.g. motor current
• CPC Class Codes: A61M 60/82 Magnetic bearings
• CPC Class Codes: A61M 60/822 specially adapted for being actively controlled
• CPC Class Codes: F02K 7/06 with combustion chambers having valves
• CPC Class Codes: F02K 7/067 having aerodynamic valves
• CPC Class Codes: F03B 11/06 Bearing arrangements
• CPC Class Codes: F03B 3/186 Spiral or volute casings
• CPC Class Codes: F04D 13/0666 the motor being of the plane gap type
• CPC Class Codes: F04D 29/048 magnetic; electromagnetic
• CPC Class Codes: F05B 2240/515 electromagnetic
• CPC Class Codes: F05D 2240/515 Electromagnetic
• CPC Class Codes: F16C 2316/18 Pumps for pumping blood
• CPC Class Codes: F16C 32/0444 Details of devices to control the actuation of the electromagnets
• CPC Class Codes: Y02E 10/20 Hydro energy
• CPC Class Codes: Y10S 415/90 Rotary blood pump

Abstract

There is provided a fluid pump wherein in a casing at a pump unit there is provided an impeller coupled with a rotor contactless and also supported contactless by a controlled magnetic bearing unit, and rotated by a motor to output a fluid, with a position detection unit, an electromagnet or a motor stator cooled by a fluid flowing through a pump chamber.

Claims

1. A fluid pump apparatus comprising:

a pump unit having in a casing a rotative member rotated to output a fluid;

a drive unit coupled with one side of said rotative member contactless through a magnetic force to levitate said one side of said rotative member while rotatably driving said one side of said rotative member;

a position detection unit detecting a position of said rotative member in levitation; and

a controlled magnetic bearing unit contactlessly supporting the other side of said rotative member in response to an output of said position detection unit,

wherein heat generated at least one of said rotative member, said position detection unit and said controlled magnetic bearing unit is released via a fluid flowing through said pump unit.

2. The fluid pump apparatus of claim 1, wherein:

said casing includes a first partition provided between said pump unit and said drive unit, and a second partition provided between said pump unit and said controlled magnetic bearing unit; and

said drive unit is attached to said first partition and said controlled magnetic bearing unit is attached to said second partition.

3. The fluid pump apparatus of claim 1, wherein said position detection unit is attached to said second partition.

4. The fluid pump apparatus of claim 1, wherein:

said rotative member is formed in a disk having a side facing said drive unit and provided with a permanent magnet arranged circumferentially; and

said rotative member and said drive unit are coupled contactless through magnetic-coupling.

5. The fluid pump apparatus of claim 4, wherein:

said rotative member is formed in a disk having a side facing said drive unit and provided with a first permanent magnet arranged circumferentially;

said drive unit is provided with a second permanent magnet arranged circumferentially to face said first permanent magnet; and

said first and second permanent magnets provide magnetic-coupling to couple said rotative member and said drive unit together contactlessly.

6. The fluid pump apparatus of claim 2, wherein said controlled magnetic bearing unit includes a plurality of electromagnets each configured of a magnetic pole, a yoke and a coil and having an S magnetic pole and an N magnetic pole with at least said yoke and coil arranged circumferentially.

7. The fluid pump apparatus of claim 2, wherein said drive unit includes a motor stator and a motor rotor rotated by a magnetic force of said motor stator, said motor stator being attached to said second partition.

8. The fluid pump apparatus of claim 1, wherein said pump unit has an internal surface coated with heparin.

9. A fluid pump apparatus having a casing, an impeller driven, levitated, a drive unit driving said impeller, a sensor sensing a position of said impeller in levitation, and a controlled magnetic bearing unit contactlessly supporting said impeller in response to an output of said sensor, wherein said casing has housed therein at least one of a position detection circuit operative in response to the output of said sensor to determine the position of said impeller in levitation, a drive circuit controlling said drive unit, and a magnetic bearing control circuit controlling said controlled magnetic bearing.

10. The fluid pump apparatus of claim 9, further comprising:

an alternate current to direct current conversion circuit converting an alternate-current voltage to a direct-current voltage; and

a direct current to direct current conversion circuit converting the direct-current voltage converted, into a different direct-current voltage,

wherein said direct current to direct current conversion circuit is housed in said casing.

11. The fluid pump apparatus of claim 9, further comprising:

a carrier wave generation circuit generating a carrier wave; and

a tuning circuit detecting a signal of said sensor tuned in to the carrier wave generated by said carrier wave generation circuit, to detect the position of said impeller in levitation,

wherein said carrier wave generation circuit and said tuning circuit are housed in said casing.